VXP-Track and Balance System Basic Kit VXP-Track and Balance System Basic Kit Ref: VXP-ECD Device used as a basic track and balance kit requiring Applications Kits. The VXP is designed to support all aircraft vibration test and balancing requirements, present and future. The digital signal processor in the acquisition unit supports spectrum analysis, multi-plane balance, narrow-band tracking and broadband vibration tasks. Applicability : EC135, EC145, H135, H145.